UIImagePickerController调用后导航栏内容上

当调起UIImagePickerController拍照时，在 debug view Hierarchy中 可看到navigationBar整体上移了20，需要在合适的时机做一次恢复原位处理。

解决思路:

1. UIImagePickerController分类中，对disappear方法交换
2. 获取上一个VC(即H5 wkwebview的VC)所在的nav
3. 在disappear时nav.navigationBar.top = kStatusBarHeight;

-(void)sx_viewWillDisappear:(BOOL)animated{
    sx_disableFixSpace = NO;
    [self sx_viewWillDisappear:animated];
    
    UINavigationController *topNav = [self getTopNavigationController];
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        //让状态栏显示
        [topNav setNeedsStatusBarAppearanceUpdate];
        //topNav.navigationBar.top = kStatusBarHeight;
        if ([topNav.viewControllers.lastObject isKindOfClass:[UITabBarController class]]) {
            UITabBarController *tabbarC = topNav.viewControllers.lastObject;
            UINavigationController * nav = tabbarC.selectedViewController;
            nav.navigationBar.top = kStatusBarHeight;
        }
    });
}

fixed: H5调系统拍照 导航栏上移20 【待研究更佳方式】